The Enameler introduces colour possibly through the use of coloured glass or by adding pigments to your glass ahead of firing. Once the glass melts and flows, it cools into a hard, clean coating about the substrate. 'Less is usually more,' states Jennifer Verruto, founder and CEO of Blythe Interiors. https://www.watchesworld.com/exploring-the-aesthetics-of-dial-design-and-decoration/